title: In vitro activity of HRE 664, a penem antibiotic.
abstract: HRE 664, a new penem antibiotic, inhibited 90% of Escherichia coli, Klebsiella, Citrobacter diversus, Proteus mirabilis, Proteus vulgaris, Salmonella, Shigella, Providencia, Aeromonas, and Morganella at less than or equal to 2 micrograms/ml but was considerably less active than cefotaxime, ceftazidime, and imipenem. It did not inhibit Pseudomonas aeruginosa (MIC greater than 128 micrograms/ml). HRE 664 inhibited Enterobacter spp., Citrobacter freundii, and Serratia marcescens at 1-8 micrograms/ml, two- to fourfold higher MICs than imipenem. HRE 664 inhibited methicillin-susceptible Staphylococcus aureus and Staphylococcus epidermidis at less than or equal to 0.12 micrograms/ml, but methicillin-resistant S. aureus and S. epidermidis were resistant. Group A, C, and G streptococci and Streptococcus pneumoniae were inhibited by 0.06 micrograms/ml. Bacteroides and Clostridium species were inhibited by 0.25 micrograms/ml comparable to imipenem. HRE 664 was not hydrolyzed by beta-lactamases TEM-1, TEM-2, TEM-3, TEM-5, SHV-1, PSE-1, PSE-4, OXA-2, OXA-3, K-1, P99, Morganella, P. vulgaris, and S. aureus PC-1 but was hydrolyzed by the beta-lactamase of Xanthomonas maltophilia.
authors.affiliation: Department of Medicine, College of Physicians and Surgeons, Columbia University, New York, New York.
authors.forename: X N
authors.initials: XN
authors.lastname: Chin
authors.forename: H C
authors.initials: HC
authors.lastname: Neu
mesh_terms: D000583:Amikacin / Q000494:pharmacology; D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D001398:Aztreonam / Q000494:pharmacology; D001419:Bacteria / Q000187:drug effects*; D002439:Cefotaxime / Q000494:pharmacology; D002442:Ceftazidime / Q000494:pharmacology; D004355:Drug Stability; D006801:Humans; D015378:Imipenem / Q000494:pharmacology; D007769:Lactams; D008826:Microbial Sensitivity Tests; D001618:beta-Lactamases / Q000378:metabolism; D047090:beta-Lactams
chemical_list: D000900:Anti-Bacterial Agents; D007769:Lactams; D047090:beta-Lactams; C053338:HRE 664; D015378:Imipenem; D000583:Amikacin; D002442:Ceftazidime; D001618:beta-Lactamases; D001398:Aztreonam; D002439:Cefotaxime